Blend/Mode/Recirc Door Operation Improper
*BLEND/MODE/RECIRC DOOR OPERATION IMPROPER
For a complete wiring diagram Consult Diagrams/Electrical
Diagnostic Test
1. CHECK FOR ACTUATOR CIRCUIT TEST FAULT MESSAGES
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the scan tool, perform the Actuator Circuit Test.
Does the scan tool display any Actuator Circuit Test fault messages?
Yes
- Return to the symptom list and choose the symptom(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
No
- Go To2
2. CHECK FOR ACTIVE HVAC DTCS
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the scan tool read active HVAC DTCs.
Does the scan tool display any active HVAC DTCs?
Yes
- Diagnose and repair the DTC(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
No
- Go To3
3. CHECK FOR HVAC DOOR RECALIBRATION FAULT MESSAGES
NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages.
Turn the ignition on.
With the scan tool, perform HVAC Door Recalibration Test.
Does the scan tool display any HVAC Door Recalibration fault messages?
Yes
- Return to the symptom list and choose the procedure(s).
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
No
- Go To4
4. IDENTIFY CORRECT PROCEDURE STEPS TO DIAGNOSE REPORTED FAULT
Which door did customer ID as faulty?
Mode Doors
- Go To5
Blend Door
- Go To6
Recirculation Door
- Go To7
5. MODE DOOR ACTUATOR(S)/LINKAGE(S)/DOOR(S)
Start the engine.
Turn the blower control to the high speed position.
NOTE: The Mode 1 door must be at its physical end of travel in the panel position to correctly direct airflow to the Mode 2 door.
NOTE: The Mode 2 door must be at its physical end of travel in the floor-defrost position to correctly direct airflow to the Mode 1 door.
Turn the mode control to each door position for a minimum of 30 seconds and check for airflow from the corresponding vents.
Does air flow from the correct vents for each door position?
Yes
- Test Complete.
No
- Remove door actuators from A/C-Heater Housing Assy. By hand, attempt to rotate the door actuators in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
6. BLEND DOOR ACTUATOR/LINKAGE/DOOR
Start the engine.
Turn the blower control to the high speed position.
Turn the mode control to the panel position.
Turn the blend control to the full hot position.
Turn the blend control to the full cold position, in 25% increments, while checking for a change in airflow air temperature coming from the panel vents.
Does the airflow air temperature change with respect to the position of the blend control?
Yes
- Test Complete.
No
- Remove door actuator from A/C-Heater Housing Assembly. By hand, attempt to rotate the door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.
7. RECIRCULATION DOOR ACTUATOR/LINKAGE/DOOR
Start the engine.
Turn the blower control to the high speed position.
Turn the mode control to the panel position.
Turn the mode control to the MAX panel position. The sound of the air flowing through the ducts should get louder as the recirculation door opens to bring in recirc air.
Does the sound of the airflow get louder after turning the control to the MAX panel position?
Yes
- Test Complete.
No
- Remove door actuator from A/C-Heater Housing Assy. By hand, attempt to rotate the door actuator in both directions. Also, inspect for disconnected, missing, or broken door actuator linkage. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.